If you want a more static feel to TheBrain when presenting I suggest using outline view in presentation mode (ctrl+shift+P). It provides a more "linear orientation" that sometimes works better for certain audiences. I also like to pin my top three ideas, so I stay focused and on message.
Remember you don't have to always click on a Thought to make a point. You can just hoover over the Thought with your curser.
When I present in TheBrain I have a Brain designed specifically for the presentation. Rarely would I show my own Brain which contains a deeper set of content that would be information overkill for most. Perhaps that's the direction you should go for your clients. Just copy a subset of your Thoughts and be more judicious with your connections for presentation purposes, then for your own operational/client management Brain link everything that works for you and have add it. You really need to sculpt a view for two different purposes. You could do that in a single Brain but two Brains might be better.
For other tips on how to present with PersonalBrain you can check out